Prosecutors said they have DNA from the accused, Genaro Sandoval, and it matches the evidence collected from a rape victim in 2003. Sandoval is charged with four other cases, but defense lawyers said there is nothing that proves Sandoval is the arroyo molester.

"What started out as a prank on Aug. 27, 2003, turned into an 11-year-old boy getting raped by the defendant," said prosecutor Lisa Traubado.

Authorities said the victim, then a sixth-grader at Hoover Middle School, decided to walk home that day because his stepmother didn’t pick him up. Prosecutors said the victim was walking along the Embodito Arroyo when Sandoval allegedly lured him under the bridge.

Prosecutors said it was a request to spray-paint the message, and then moon Sandoval's video camera as a supposed joke to someone Sandoval knew that got the boy's attention. Sandoval also told the boy he'd pay him, and when the boy agreed, that's when prosecutors said Sandoval attacked.

"There is absolutely no one else on earth who it could be other than the defendant," Traubado said.

The defense promises to attack the DNA samples taken from both the victim in the 2003 attack and Sandoval.

"If the DNA was correct, it would support all the other pieces of evidence," said defense lawyer Joe Riggs.

Riggs said the case against Sandoval wasn’t solid from the start.

"(The victim) was clearly shaken, but he was remarkably lucid about what had happened to him just moments before," Riggs said.

The victim will take the stand at some point, but prosecutors said they aren't sure when.

The trial is expected to last a few weeks, and if convicted, Sandoval faces 18 years in prison.